SANTOS, C. C. P.; http://lattes.cnpq.br/7039048394691306; SANTOS, Cecília Clarice Pereira dos.
Resumen:
Goat farming is a well-developed activity in the Brazilian Northeast region. Goats are
animals adaptable to the climate and native vegetation of the caatinga, for this reason
the Northeast holds about 92.7% of the country's goat herd. The crossbreeding between
SRD goat genotypes with specialized genotypes in higher production such as Boer and
Savannah is very common, because the SRD goats have hardiness, but low productivity,
which occurs exactly the opposite with specialized breeds, so when this type of
crossbreeding is done it seeks to obtain more resistant animals and increases the
productivity of herds. In addition, crossbreeding between breeds can increase the weight
of the animals, reaching the slaughter phase in less time and greater weight, increasing
carcass yield, increased muscularity, better weights of meat cuts, consequently higher
income for the producer and product quality for the consumer. Therefore, the objective
of the research was to evaluate the regional and tissue composition of the carcass of
goat genotypes submitted to diets with different volume/concentrate ratios. The
experiment was carried out at the Pendência Experimental Station of the Empresa
Estadual de Pesquisa Agropecuária da Paraíba (EMEPA). Thirty goats of different
genetic groups (10 SRD, 10 ½ Boer x SRD and 10 ½ Savanna x SRD), with an average
age of 120 days and an average initial live weight of 18 kg were used, the goats were
confined in cages and subjected to two diets with concentrate:volume ratio (50:50 and
30:70). The goats were distributed in an entirely randomized design in a 3x2 factorial
scheme (three genotypes and two diets). When the animals completed 90 days of the
experiment, they were slaughtered and the carcass was sectioned, making use of the left
½ carcass to obtain the commercial cuts: neck, shoulder, rib, loin and leg, which were
submitted to physical dissection of bones, muscles, fat and other tissues. There was an
interaction between genotypes and diets for pallet cut weight, neck cut weight and yield,
rib eye intermuscular fat yield, loin muscle and muscle:bone ratio and total fat, and leg
intermuscular fat. The regional composition of the carcass of non-bred and mixed Boer
and Savannah goats were similar, except for the shoulder weight and neck weight. The
tissue composition showed a higher percentage of muscle for those animals improved
with Boer and Savannah in all cuts, obtaining effect of the crossbreeding, however the
diet with a higher proportion of concentrate did not have a positive effect on the various
variables analyzed, indicating that the proportion of lower concentrate already meets the
needs of goats.